Hi All, I dug a NOS Nicklin cottered tandem chainset from a back shelf. It is nothing fancy, chainwheels swaged onto cranks, but is immaculate. Big thingy is 48 T, little thingies are 32T. Looks to be 3/32". You could use the small chainwheel on a polo bike I suppose. Anyway comes as a single package, and weighs about 4 lbs. Shipping in US only. Cost $50.00 + shipping. Paypal preferred. All the best, Phil Easton, Cambria, California, USA